The synthesis of 1-(nonafluoro-t-butyl)-3-trifluoromethylpyrazoles (3) from hexafluoroacetone azine (1) and alkoxyacetylenes is described; the reaction involves an azomethine imide intermediate which rearranges by apparent [1,4] migration of a trifluoromethyl group.
F. Hein, K. Burger and J. Firl, J. Chem. Soc., Chem. Commun., 1979, 792 DOI: 10.1039/C39790000792
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